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The feyr and the greater feyr first appeared in the second edition for the Forgotten Realms setting in the Monstrous Compendium Forgotten Realms Appendix II (1991).[1] The feyr and great feyr appeared in the Monstrous Manual (1993). The feyr and greater feyr was further detailed in Dragon Annual #5 (2000), along with the lesser feyr and larval feyr.[2]

A feyr resembles a large human brain with a partial layer of skin stretched over it, with many tentacles for walking and grabbing at unwary travellers. The "face" of the Feyr is a seemingly random collection of large, golden eyes and mouths filled with sharp, needle-like teeth.

Owing to their conception, feyrs are found most commonly in places where large numbers of magic-users gather, such as cities.

Most Feyrs do not last beyond the night of their creation, since they die instantly when exposed to sunlight, but larger versions of the creature known as "Great Feyrs" are immune to the effects of sunlight. Great Feyrs still despise sunlight, though, and mainly come out at night, preferring to lie low in secluded spots during the day.

Dragon magazine, in its Dragon Annual #5, presented an article titled "Creature Codex: Nothing to Fear" that detailed the ecology of the feyr and gave (then new) third edition statistics. While not an official addendum to the rules, it introduced a larval stage to the feyr lifecycle and added the concept of a human enslaved by a greater feyr to become a familiar of sorts. The article also discussed how a feyr might seek to cause chaos within a city to provide itself with a steady psychic food source or even ally with other creatures for the same effect.